Reference Design

A system-level evaluation board that combines ROHM's IC and discrete products. We have already solved not only the characteristics of individual products but also the problems that may occur when combining them to build a system, thus contributing significantly to the reduction of development time for our customers.

Non-Isolation Buck Converter PWM method Output 2W10V Reference Design


The BM2P109TF evaluation board outputs 10V voltage from the input of 90Vac to 264Vac.The output current supplies up to 0.2A. BM2P109TF which is PWM method DC/DC converter IC built-in 650V MOSFET is used.

The BM2P109TF contributes to low power consumption by built-in a 650V starting circuit. Built-in current detection resistor realizes compact power supply design.
Current mode control imposes current limitation on every cycle, providing superior performance in bandwidth and transient response.
The switching frequency is 100kHz in fixed mode. At light load, frequency is reduced and high efficiency is realized. Built-in frequency hopping function contributes to low EMI. Low 9.5Ω 650V MOSFET built-in contributes to low power consumption and easy design.


Reference Board NameBM2P109TF-EVK-001
Input Voltage Range90 to 264Vac
Input Frequency47 to 63Hz
Output Voltage10.0V(Typ)
Maximum Output Power2.0W(Max)Iout=200mA
Output Current Range2 to 200mA*1
Stand-by Power20mW Iout=0A
Efficiency 74.5% Iout=200mA
Output Ripple Voltage35mVpp*2
Operating Temperature-10 to 65deg.C

*1 Please adjust operating time, within any parts surface temperature under 105 °C
*2 Not include spike noise


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3D Modelthermal
Calc toolEVK, Eval board for individual product

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